/*
 * boarddelegate.cpp - Gomoku Game plugin
 * Copyright (C) 2011  Aleksey Andreev
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * You can also redistribute and/or modify this program under the
 * terms of the Psi License, specified in the accompanied COPYING
 * file, as published by the Psi Project; either dated January 1st,
 * 2005, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 */

#include <QStyleOptionViewItem>

#include "boarddelegate.h"
#include "common.h"

BoardPixmaps::BoardPixmaps(QObject *parent) :
	QObject(parent),
	width(-1), height(-1),
	w_cnt(1), h_cnt(1)
{
	boardPixmap = new QPixmap(":/gomokugameplugin/goban1");
}

BoardPixmaps::~BoardPixmaps()
{
	clearPix();
	delete boardPixmap;
}

void BoardPixmaps::clearPix()
{
	QList<QPixmap *> values = scaledPixmap.values();
	while (!values.isEmpty()) {
		delete values.takeLast();
	}
	scaledPixmap.clear();
}

QPixmap *BoardPixmaps::getBoardPixmap(int x, int y, double w, double h)
{
	if (w != width || h != height) {
		width = w;
		height = h;
		clearPix();
	}
	QPixmap *scPixmap = scaledPixmap.value(0, NULL);
	if (scPixmap == NULL) {
		// Масштабирование картинки под целое количество единиц ширины и высоты
		scPixmap = new QPixmap();
		w_cnt = boardPixmap->width() / w;
		h_cnt = boardPixmap->height() / h;
		// Тут можно ограничить максимальное количество кусков
		//--
		*scPixmap = boardPixmap->scaled(QSize(w_cnt * w, h_cnt * h), Qt::IgnoreAspectRatio, Qt::FastTransformation);
		scaledPixmap[0] = scPixmap;
	}
	int curr_key = (x % w_cnt) * 100 + (y % h_cnt) + 1;
	QPixmap *scPixmap2 = scaledPixmap.value(curr_key, NULL);
	if (scPixmap2 == NULL) {
		// Вырезаем необходимый кусок картинки
		scPixmap2 = new QPixmap();
		int xpixpos = (x % w_cnt) * w;
		int ypixpos = (y % h_cnt) * h;
		*scPixmap2 = scPixmap->copy(xpixpos, ypixpos, w, h);
		scaledPixmap[curr_key] = scPixmap2;
	}
	return scPixmap2;
}

// -----------------------------------------------------------------------------

BoardDelegate::BoardDelegate(BoardModel *model, QObject *parent) :
    QItemDelegate(parent),
    model_(model),
    skin(0),
    pixmaps(NULL)
{
}

void BoardDelegate::setSkin(int skin_num)
{
	if (skin != skin_num) {
		skin = skin_num;
		if (skin == 0) {
			if (pixmaps != NULL) {
				delete pixmaps;
				pixmaps = NULL;
			}
		} else {
			if (pixmaps == NULL) {
				pixmaps	= new BoardPixmaps(this);
			}
		}
	}
}

void BoardDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
	// Проверки
	if (!index.isValid())
		return;
	int row = index.row();
	if (row <= 0 || row >= model_->rowCount() - 1)
		return;
	int col = index.column();
	if (col <= 0 || col >= model_->columnCount() - 1)
		return;
	painter->save();
	QRectF rect(option.rect);
	// Отрисовка фона
	if (skin == 0) {
		QBrush fill_brush(QColor(220, 179, 92, 255), Qt::SolidPattern);
		painter->fillRect(rect, fill_brush);
	} else {
		QPixmap *pixmap = pixmaps->getBoardPixmap(col - 1, row - 1, rect.width(), rect.height());
		painter->drawPixmap(rect, *pixmap, pixmap->rect());
	}
	QBrush brush1(Qt::SolidPattern);
	int row_min = 2;
	int row_max = model_->rowCount() - 3;
	int col_min = 2;
	int col_max = model_->columnCount() - 3;
	if (row >= row_min && row <= row_max && col >= col_min && col <= col_max) {
		// Отрисовка центральных линий
		qreal x = rect.left() + rect.width() / 2.0;
		qreal y = rect.top() + rect.height() / 2.0;
		painter->setPen(Qt::darkGray);
		painter->drawLine(rect.left(), y - 1, rect.right(), y - 1);
		painter->drawLine(x - 1, rect.top(), x - 1, rect.bottom());
		painter->setPen(Qt::lightGray);
		painter->drawLine(rect.left(), y, rect.right(), y);
		painter->drawLine(x, rect.top(), x, rect.bottom());
		// Отрисовка разделителя
		if (row == row_min || col == col_min || row == row_max || col == col_max) {
			painter->setPen(Qt::black);
			if (row == row_min) {
				painter->drawLine(rect.topLeft(), rect.topRight());
			} else if (row == row_max) {
				QPointF p1 = rect.bottomLeft();
				p1.setY(p1.y() - 1.0);
				QPointF p2 = rect.bottomRight();
				p2.setY(p2.y() - 1.0);
				painter->drawLine(p1, p2);
			}
			if (col == col_min) {
				painter->drawLine(rect.topLeft(), rect.bottomLeft());
			} else if (col == col_max) {
				QPointF p1 = rect.topRight();
				p1.setX(p1.x() - 1);
				QPointF p2 = rect.bottomRight();
				p2.setX(p2.x() - 1);
				painter->drawLine(p1, p2);
			}
		}
		if (model_->selectX == col && model_->selectY == row) {
			brush1.setColor(QColor(0, 255, 0, 64));
			painter->fillRect(rect, brush1);
		}
		// Отрисовка если курсор мыши над клеткой
		if (option.state & QStyle::State_MouseOver) {
			brush1.setColor(QColor(0, 0, 0, 32));
			painter->fillRect(rect, brush1);
		}
		rect.setWidth(rect.width() - 1);
		rect.setHeight(rect.height() - 1);
		// Отрисовка если клетка выбрана
		if (option.state & QStyle::State_Selected) {
			QRectF rect2(rect);
			rect2.setLeft(rect2.left() + 1);
			rect2.setTop(rect2.top() + 1);
			rect2.setWidth(rect2.width() - 1);
			rect2.setHeight(rect2.height() - 1);
			painter->setPen(Qt::gray);
			painter->drawRect(rect2);
		}
		// Отрисовка элемента
		const GameElement *el = model_->getGameElement(col, row);
		if (el) {
			el->paint(painter, rect);
		}
	} else {
		// Рисуем координаты
		if ((row == 1 || row == model_->columnCount() - 2) && col >= 2 && col <= model_->columnCount() - 3) {
			// Буквы
			QString text = horHeaderString.at(col - 2);
			painter->drawText(rect, Qt::AlignCenter,text, 0);
		} else if ((col == 1 || model_->rowCount() - 2) && row >= 2 && row <= model_->rowCount() - 3) {
			// Цифры
			QString text = QString::number(row - 1);
			painter->drawText(rect, Qt::AlignCenter,text, 0);
		}
	}
	painter->restore();
}
